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#!/usr/bin/env node
'use strict'
const fs = require('fs')
const crypto = require('crypto')
const process = require('process')
const https = require('https')
const child_process = require('child_process')
const path = require('path')
const lockfile = require('./yarnpkg-lockfile.js')
const { promisify } = require('util')
const url = require('url')
const { urlToName } = require('./common.js')
const execFile = promisify(child_process.execFile)
const exec = async (...args) => {
const res = await execFile(...args)
if (res.error) throw new Error(res.stderr)
return res
}
const downloadFileHttps = (fileName, url, expectedHash, hashType = 'sha1') => {
return new Promise((resolve, reject) => {
const get = (url, redirects = 0) => https.get(url, (res) => {
if(redirects > 10) {
reject('Too many redirects!');
return;
}
if(res.statusCode === 301 || res.statusCode === 302) {
return get(res.headers.location, redirects + 1)
}
const file = fs.createWriteStream(fileName)
const hash = crypto.createHash(hashType)
res.pipe(file)
res.pipe(hash).setEncoding('hex')
res.on('end', () => {
file.close()
const h = hash.read()
if (h != expectedHash) return reject(new Error(`hash mismatch, expected ${expectedHash}, got ${h}`))
resolve()
})
res.on('error', e => reject(e))
})
get(url)
})
}
const downloadGit = async (fileName, url, rev) => {
await exec('nix-prefetch-git', [
'--out', fileName + '.tmp',
'--url', url,
'--rev', rev,
'--builder'
])
await exec('tar', [
// hopefully make it reproducible across runs and systems
'--owner=0', '--group=0', '--numeric-owner', '--format=gnu', '--sort=name', '--mtime=@1',
// Set u+w because tar-fs can't unpack archives with read-only dirs: https://github.com/mafintosh/tar-fs/issues/79
'--mode', 'u+w',
'-C', fileName + '.tmp',
'-cf', fileName, '.'
])
await exec('rm', [ '-rf', fileName + '.tmp', ])
}
const isGitUrl = pattern => {
// https://github.com/yarnpkg/yarn/blob/3119382885ea373d3c13d6a846de743eca8c914b/src/resolvers/exotics/git-resolver.js#L15-L47
const GIT_HOSTS = ['github.com', 'gitlab.com', 'bitbucket.com', 'bitbucket.org']
const GIT_PATTERN_MATCHERS = [/^git:/, /^git\+.+:/, /^ssh:/, /^https?:.+\.git$/, /^https?:.+\.git#.+/]
for (const matcher of GIT_PATTERN_MATCHERS) if (matcher.test(pattern)) return true
const {hostname, path} = url.parse(pattern)
if (hostname && path && GIT_HOSTS.indexOf(hostname) >= 0
// only if dependency is pointing to a git repo,
// e.g. facebook/flow and not file in a git repo facebook/flow/archive/v1.0.0.tar.gz
&& path.split('/').filter(p => !!p).length === 2
) return true
return false
}
const downloadPkg = (pkg, verbose) => {
const [ name, spec ] = pkg.key.split('@', 2);
if (spec.startsWith('file:')) {
console.info(`ignoring relative file:path dependency "${spec}"`)
return
}
const [ url, hash ] = pkg.resolved.split('#')
if (verbose) console.log('downloading ' + url)
const fileName = urlToName(url)
if (url.startsWith('https://codeload.github.com/') && url.includes('/tar.gz/')) {
const s = url.split('/')
return downloadGit(fileName, `https://github.com/${s[3]}/${s[4]}.git`, s[s.length-1])
} else if (url.startsWith('https://github.com/') && url.endsWith('.tar.gz')) {
const s = url.split('/')
return downloadGit(fileName, `https://github.com/${s[3]}/${s[4]}.git`, s[s.length-1].replace(/.tar.gz$/, ''))
} else if (isGitUrl(url)) {
return downloadGit(fileName, url.replace(/^git\+/, ''), hash)
} else if (url.startsWith('https://')) {
if (typeof pkg.integrity === 'string' || pkg.integrity instanceof String) {
const [ type, checksum ] = pkg.integrity.split('-')
return downloadFileHttps(fileName, url, Buffer.from(checksum, 'base64').toString('hex'), type)
}
return downloadFileHttps(fileName, url, hash)
} else if (url.startsWith('file:')) {
console.warn(`ignoring unsupported file:path url "${url}"`)
} else {
throw new Error('don\'t know how to download "' + url + '"')
}
}
const performParallel = tasks => {
const worker = async () => {
while (tasks.length > 0) await tasks.shift()()
}
const workers = []
for (let i = 0; i < 4; i++) {
workers.push(worker())
}
return Promise.all(workers)
}
const prefetchYarnDeps = async (lockContents, verbose) => {
const lockData = lockfile.parse(lockContents)
const tasks = Object.values(
Object.entries(lockData.object)
.map(([key, value]) => {
return { key, ...value }
})
.reduce((out, pkg) => {
out[pkg.resolved] = pkg
return out
}, {})
)
.map(pkg => () => downloadPkg(pkg, verbose))
await performParallel(tasks)
await fs.promises.writeFile('yarn.lock', lockContents)
if (verbose) console.log('Done')
}
const showUsage = async () => {
process.stderr.write(`
syntax: prefetch-yarn-deps [path to yarn.lock] [options]
Options:
-h --help Show this help
-v --verbose Verbose output
--builder Only perform the download to current directory, then exit
`)
process.exit(1)
}
const main = async () => {
const args = process.argv.slice(2)
let next, lockFile, verbose, isBuilder
while (next = args.shift()) {
if (next == '--builder') {
isBuilder = true
} else if (next == '--verbose' || next == '-v') {
verbose = true
} else if (next == '--help' || next == '-h') {
showUsage()
} else if (!lockFile) {
lockFile = next
} else {
showUsage()
}
}
let lockContents
try {
lockContents = await fs.promises.readFile(lockFile || 'yarn.lock', 'utf-8')
} catch {
showUsage()
}
if (isBuilder) {
await prefetchYarnDeps(lockContents, verbose)
} else {
const { stdout: tmpDir } = await exec('mktemp', [ '-d' ])
try {
process.chdir(tmpDir.trim())
await prefetchYarnDeps(lockContents, verbose)
const { stdout: hash } = await exec('nix-hash', [ '--type', 'sha256', '--base32', tmpDir.trim() ])
console.log(hash)
} finally {
await exec('rm', [ '-rf', tmpDir.trim() ])
}
}
}
main()
.catch(e => {
console.error(e)
process.exit(1)
})
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